/* Emit x86/x64 text relocations. */
static void emit_asm_reloc_text(BuildCtx *ctx, uint8_t *cp, int n,
const char *sym)
{
const char *opname = NULL;
if (--n < 0) goto err;
if (cp[n] == 0xe8) {
opname = "call";
} else if (cp[n] == 0xe9) {
opname = "jmp";
} else if (cp[n] >= 0x80 && cp[n] <= 0x8f && n > 0 && cp[n-1] == 0x0f) {
opname = jccnames[cp[n]-0x80];
n--;
} else {
err:
fprintf(stderr, "Error: unsupported opcode for %s symbol relocation.\n",
sym);
exit(1);
}
emit_asm_bytes(ctx, cp, n);
if (strncmp(sym+(*sym == '_'), LABEL_PREFIX, sizeof(LABEL_PREFIX)-1)) {
/* Various fixups for external symbols outside of our binary. */
if (ctx->mode == BUILD_elfasm) {
if (LJ_32)
fprintf(ctx->fp, "#if __PIC__\n\t%s lj_wrap_%s\n#else\n", opname, sym);
fprintf(ctx->fp, "\t%s %s@PLT\n", opname, sym);
if (LJ_32)
fprintf(ctx->fp, "#endif\n");
return;
} else if (LJ_32 && ctx->mode == BUILD_machasm) {
fprintf(ctx->fp, "\t%s L%s$stub\n", opname, sym);
return;
}
}
fprintf(ctx->fp, "\t%s %s\n", opname, sym);
}
/* Emit relocation for the incredibly stupid OSX assembler. */
static void emit_asm_reloc_mach(BuildCtx *ctx, uint8_t *cp, int n,
const char *sym)
{
const char *opname = NULL;
if (--n < 0) goto err;
if (cp[n] == 0xe8) {
opname = "call";
} else if (cp[n] == 0xe9) {
opname = "jmp";
} else if (cp[n] >= 0x80 && cp[n] <= 0x8f && n > 0 && cp[n-1] == 0x0f) {
opname = jccnames[cp[n]-0x80];
n--;
} else {
err:
fprintf(stderr, "Error: unsupported opcode for %s symbol relocation.\n",
sym);
exit(1);
}
emit_asm_bytes(ctx, cp, n);
fprintf(ctx->fp, "\t%s %s\n", opname, sym);
}